Synthesis and Characterization of the New Strontium Borogermanate Sr_{3–<i>x</i>/2}B_2–<i>x</i>Ge_4+<i>x</i>O₁₄ (<i>x</i> = 0.32)

The strontium borogermanate Sr_{3–<i>x</i>/2}B_2–<i>x</i>Ge_4+<i>x</i>O₁₄ (<i>x</i> = 0.32) was synthesized by high-temperature solid-state reaction of SrO, GeO₂, and H₃BO₃ in a NaF/KF flux system using platinum crucibles. The structure determination revealed that Sr_{3–<i>x</i>/2}B_2–<i>x</i>Ge_4+<i>x</i>O₁₄ (<i>x</i> = 0.32) crystallizes in the trigonal space group <i>P</i>321 (No. 150) with the parameters <i>a</i> = 800.7(2) and <i>c</i> = 488.8(2) pm, with <i>R</i>1 = 0.0281, <i>wR</i>2 = 0.0671 (all data), and <i>Z</i> = 1. The crystal structure of Sr_{3–<i>x</i>/2}B_2–<i>x</i>Ge_4+<i>x</i>O₁₄ (<i>x</i> = 0.32) consists of distorted SrO₈ cubes, GeO₆ octahedra, GeO₄ tetrahedra, and BO₄ tetrahedra. In addition to the structural investigations, Raman and IR spectroscopic investigations were carried out